How does the EPRU work?Fluorescent lamps - this is a real technological progress that a few decades ago shook all the science and technology. But the first fluorescent lamps had many drawbacks, among which were short working hours, characteristic noise from the operation of luminescent elements and expensive maintenance.


  • 1 Electronic ballast (ECG)
  • 2 Advantages of EPRU
  • 3 How does the EPRU work?

Electronic ballast (ECG)

Advantages of EPRU To solve such very important problems with lamps, engineers invented a special electronic control gear a device that really reduces power consumption, increases durability and virtually removes the characteristic sounds from the lamps.

When applying the EPRU technology the duration of the fluorescent lamps increased up to 12 000 - 15 000 hours. If to compare, then this indicator at accumulation lamps is equal to three thousand hours. The same applies to the brightness indicators, which are almost five times higher than the previous indicators for accumulation lamps.

A fluorescent lamp is a gas discharge source of bright daylight, which operates on the basis of the electric field effect in hermetically sealed glass tubes with uploaded mercury. It is through such an impact that a discharge occurs in the tubes of the lamps, which

accompanied by a characteristic ultraviolet raycreating light emission. Light itself is created by the use of phosphor as converter ultraviolet radiation. When choosing the appropriate types of this substance, you can adjust the color flow of the lamps.

Fluorescent lamps are divided into:

  • annular;
  • U-shaped;
  • compact;

The natural disadvantage of a fluorescent lamp is their negative internal resistance, due to which they simply can not directly work with the electrical voltage of the network. But with the help of electronic ballasts EPRU this problem simply disappears.

When using the EPRS, the cathodes are preheated, which is responsible for the emission of electrodes in the lamp. Also, the EPRU creates a starting voltage and limits the flow of current.

Electronic ballasts for fluorescent lamps of electronic ballasts are an excellent technological solution, which maximally accelerates this type of lamp and solves numerous problems with their work.

During the closure of the EPRS, the main mains voltage is transferred to the starter, consisting of a special glass cylinder with a supply of inert gas with bimetallic elements. As well as the condenser, and a cylinder are placed in two separate capacities.

Due to the influence of the mains voltage, the gap with the inert gas undergoes an ionization process.

Electronic ballastThe history of such a device as an EPRU goes back to the distant 80s, although electronic ballasts for fluorescent lamps became more widely used in the early 90s.

Such a device is designed to control the start-up and maintain optimal operating conditions in gas discharge fluorescent lamps.

Until the advent of the EPRU, mankind used classic ballasts. But unfortunately, these devices had many characteristic flaws. Among them are:

  • very bulky and loud choke, which is equipped with a not very high-quality starter;
  • the presence of the gating effect and constant flicker depending on the frequency of the network;
  • starter that has failed very often causes a false start effect, due to which the lifespan of filaments is significantly reduced;
  • huge energy losses and low efficiency.

Until the appearance of the EPRS, such devices practically did not eliminate the existing problems with fluorescent lamps. Terms of their service remained the same short.

For these reasons, domestic manufacturers are seriously thinking about the release of more functional devices with a high level of efficiency and without such disadvantages. The result of a long hard work in the early 80s came to the market electronic ballasts for fluorescent devices - EPRU, which very quickly took root in domestic production and completely ousted their predecessors. Unique EPRU technology became a real technological breakthrough, with the help of which problems with the work and service life of lamps has increased rapidly.

Advantages of EPRU

In addition to the absence of significant shortcomings, as in the case of previous ballasts, electronic ballasts have many advantages. Among them are:

  • Fluorescent lamps, equipped with EPRS, run smoothly and quickly, without unpleasant blinking and noiseextended service life of fluorescent devices, which is ensured by a special “warm” start without unnecessary reloads;
  • stylish lighting at any range of supply voltage, which is impossible to provide with classic ballasts.
  • Additional option with support for smooth adjustment of light intensity and brightness.

In addition, the power of new EPRS is much higher than that of standard electronic ballasts, which is ensured by the use of advanced technologies and additional elements.

In general, the new technology of electronic ballasts is really much better and more functional than its predecessor.

How does the EPRU work?

As standard, the electronic control gear for fluorescent equipment comes with:

  • electromagnetic interference filter which responsible for filtering, as well as members of the EPRU, and outgoing from the ballast interference;
  • rectifier;
  • power correction circuit (supplied as an optional kit);
  • smoothing filter;
  • ballast;
  • an inverter;

At the same time, the latter device can be supplied with an additional regulator of brightness indicators, which is intended for fine-tuning electronic ballast.

The second element mentioned above, which is responsible for power factor correction, can be both bridge and half bridge.

What is electronic ballast for fluorescent lamps?On the modern market of such equipment there are many EPRS devices from various manufacturers and brands. Costly models are always made of higher quality materials when applying advanced technology to production. Naturally, cheaper EPRUs cannot guarantee this quality of work, as is the case with the first offers.

We must not forget that absolutely all EPRS, regardless of the manufacturer, may have a number of noticeable flaws. The main one is the probability of breakage when working in abnormal conditions associated with weather or other favorite changes.

The same applies to the normal mode of the EPRS, which does not always remain at the normal optimal level. Most often this is the cause of elevated temperatures in the transistors of the half bridge of the EPRS.

Epr is really extremely important and necessary element in fluorescent lamps, without which they simply cannot fully function and fulfill their main tasks.